The term "first stage" can have different meanings depending on the context in which it is used. Generally, when referring to a process or sequence of events, the first stage indicates the initial phase or step towards achieving an end goal. It could also refer to the beginning or starting point of something.
For example, in project management, the "first stage" would typically be the planning and preparation phase before any actual work begins. In a larger process such as developing a product, the first stage might involve research and development, while in a more personal context it could refer to the initial stages of learning or growing up.
Overall, the phrase "first stage" implies that something is happening for the very first time, whether it's an action, event, or process.